/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
#ifndef http_parser_h
#define http_parser_h

#include "../../config.h"
#if (SCRIPT_ENGINE_TYPE == SCRIPT_ENGINE_V8) && SE_ENABLE_INSPECTOR

    #ifdef __cplusplus
extern "C" {
    #endif

    /* Also update SONAME in the Makefile whenever you change these. */
    #define HTTP_PARSER_VERSION_MAJOR 2
    #define HTTP_PARSER_VERSION_MINOR 7
    #define HTTP_PARSER_VERSION_PATCH 0

    #include <sys/types.h>
    #if defined(_WIN32) && !defined(__MINGW32__) && \
        (!defined(_MSC_VER) || _MSC_VER < 1600) && !defined(__WINE__)
        #include <BaseTsd.h>
        #include <stddef.h>
typedef __int8 int8_t;
typedef unsigned __int8 uint8_t;
typedef __int16 int16_t;
typedef unsigned __int16 uint16_t;
typedef __int32 int32_t;
typedef unsigned __int32 uint32_t;
typedef __int64 int64_t;
typedef unsigned __int64 uint64_t;
    #else
        #include <cstdint>
    #endif

    /* Compile with -DHTTP_PARSER_STRICT=0 to make less checks, but run
 * faster
 */
    #ifndef HTTP_PARSER_STRICT
        #define HTTP_PARSER_STRICT 1
    #endif

    /* Maximium header size allowed. If the macro is not defined
 * before including this header then the default is used. To
 * change the maximum header size, define the macro in the build
 * environment (e.g. -DHTTP_MAX_HEADER_SIZE=<value>). To remove
 * the effective limit on the size of the header, define the macro
 * to a very large number (e.g. -DHTTP_MAX_HEADER_SIZE=0x7fffffff)
 */
    #ifndef HTTP_MAX_HEADER_SIZE
        #define HTTP_MAX_HEADER_SIZE (80 * 1024)
    #endif

using http_parser = struct http_parser;
using http_parser_settings = struct http_parser_settings;

/* Callbacks should return non-zero to indicate an error. The parser will
 * then halt execution.
 *
 * The one exception is on_headers_complete. In a HTTP_RESPONSE parser
 * returning '1' from on_headers_complete will tell the parser that it
 * should not expect a body. This is used when receiving a response to a
 * HEAD request which may contain 'Content-Length' or 'Transfer-Encoding:
 * chunked' headers that indicate the presence of a body.
 *
 * Returning `2` from on_headers_complete will tell parser that it should not
 * expect neither a body nor any futher responses on this connection. This is
 * useful for handling responses to a CONNECT request which may not contain
 * `Upgrade` or `Connection: upgrade` headers.
 *
 * http_data_cb does not return data chunks. It will be called arbitrarily
 * many times for each string. E.G. you might get 10 callbacks for "on_url"
 * each providing just a few characters more data.
 */
using http_data_cb = int (*)(http_parser *, const char *, size_t);
using http_cb = int (*)(http_parser *);

    /* Request Methods */
    #define HTTP_METHOD_MAP(XX)          \
        XX(0, DELETE, DELETE)            \
        XX(1, GET, GET)                  \
        XX(2, HEAD, HEAD)                \
        XX(3, POST, POST)                \
        XX(4, PUT, PUT)                  \
        /* pathological */               \
        XX(5, CONNECT, CONNECT)          \
        XX(6, OPTIONS, OPTIONS)          \
        XX(7, TRACE, TRACE)              \
        /* WebDAV */                     \
        XX(8, COPY, COPY)                \
        XX(9, LOCK, LOCK)                \
        XX(10, MKCOL, MKCOL)             \
        XX(11, MOVE, MOVE)               \
        XX(12, PROPFIND, PROPFIND)       \
        XX(13, PROPPATCH, PROPPATCH)     \
        XX(14, SEARCH, SEARCH)           \
        XX(15, UNLOCK, UNLOCK)           \
        XX(16, BIND, BIND)               \
        XX(17, REBIND, REBIND)           \
        XX(18, UNBIND, UNBIND)           \
        XX(19, ACL, ACL)                 \
        /* subversion */                 \
        XX(20, REPORT, REPORT)           \
        XX(21, MKACTIVITY, MKACTIVITY)   \
        XX(22, CHECKOUT, CHECKOUT)       \
        XX(23, MERGE, MERGE)             \
        /* upnp */                       \
        XX(24, MSEARCH, M - SEARCH)      \
        XX(25, NOTIFY, NOTIFY)           \
        XX(26, SUBSCRIBE, SUBSCRIBE)     \
        XX(27, UNSUBSCRIBE, UNSUBSCRIBE) \
        /* RFC-5789 */                   \
        XX(28, PATCH, PATCH)             \
        XX(29, PURGE, PURGE)             \
        /* CalDAV */                     \
        XX(30, MKCALENDAR, MKCALENDAR)   \
        /* RFC-2068, section 19.6.1.2 */ \
        XX(31, LINK, LINK)               \
        XX(32, UNLINK, UNLINK)

enum http_method { //NOLINT(readability-identifier-naming)
    #define XX(num, name, string) HTTP_##name = num,
    HTTP_METHOD_MAP(XX)
    #undef XX
};

enum http_parser_type { HTTP_REQUEST, //NOLINT(readability-identifier-naming)
                        HTTP_RESPONSE,
                        HTTP_BOTH };

/* Flag values for http_parser.flags field */
enum flags { F_CHUNKED = 1 << 0, //NOLINT(readability-identifier-naming)
             F_CONNECTION_KEEP_ALIVE = 1 << 1,
             F_CONNECTION_CLOSE = 1 << 2,
             F_CONNECTION_UPGRADE = 1 << 3,
             F_TRAILING = 1 << 4,
             F_UPGRADE = 1 << 5,
             F_SKIPBODY = 1 << 6,
             F_CONTENTLENGTH = 1 << 7
};

    /* Map for errno-related constants
 *
 * The provided argument should be a macro that takes 2 arguments.
 */
    #define HTTP_ERRNO_MAP(XX)                                              \
        /* No error */                                                      \
        XX(OK, "success")                                                   \
                                                                            \
        /* Callback-related errors */                                       \
        XX(CB_message_begin, "the on_message_begin callback failed")        \
        XX(CB_url, "the on_url callback failed")                            \
        XX(CB_header_field, "the on_header_field callback failed")          \
        XX(CB_header_value, "the on_header_value callback failed")          \
        XX(CB_headers_complete, "the on_headers_complete callback failed")  \
        XX(CB_body, "the on_body callback failed")                          \
        XX(CB_message_complete, "the on_message_complete callback failed")  \
        XX(CB_status, "the on_status callback failed")                      \
        XX(CB_chunk_header, "the on_chunk_header callback failed")          \
        XX(CB_chunk_complete, "the on_chunk_complete callback failed")      \
                                                                            \
        /* Parsing-related errors */                                        \
        XX(INVALID_EOF_STATE, "stream ended at an unexpected time")         \
        XX(HEADER_OVERFLOW,                                                 \
           "too many header bytes seen; overflow detected")                 \
        XX(CLOSED_CONNECTION,                                               \
           "data received after completed connection: close message")       \
        XX(INVALID_VERSION, "invalid HTTP version")                         \
        XX(INVALID_STATUS, "invalid HTTP status code")                      \
        XX(INVALID_METHOD, "invalid HTTP method")                           \
        XX(INVALID_URL, "invalid URL")                                      \
        XX(INVALID_HOST, "invalid host")                                    \
        XX(INVALID_PORT, "invalid port")                                    \
        XX(INVALID_PATH, "invalid path")                                    \
        XX(INVALID_QUERY_STRING, "invalid query string")                    \
        XX(INVALID_FRAGMENT, "invalid fragment")                            \
        XX(LF_EXPECTED, "LF character expected")                            \
        XX(INVALID_HEADER_TOKEN, "invalid character in header")             \
        XX(INVALID_CONTENT_LENGTH,                                          \
           "invalid character in content-length header")                    \
        XX(UNEXPECTED_CONTENT_LENGTH,                                       \
           "unexpected content-length header")                              \
        XX(INVALID_CHUNK_SIZE,                                              \
           "invalid character in chunk size header")                        \
        XX(INVALID_CONSTANT, "invalid constant string")                     \
        XX(INVALID_INTERNAL_STATE, "encountered unexpected internal state") \
        XX(STRICT, "strict mode assertion failed")                          \
        XX(PAUSED, "parser is paused")                                      \
        XX(UNKNOWN, "an unknown error occurred")

    /* Define HPE_* values for each errno value above */
    #define HTTP_ERRNO_GEN(n, s) HPE_##n,
enum http_errno { //NOLINT(readability-identifier-naming)
    HTTP_ERRNO_MAP(HTTP_ERRNO_GEN)
};
    #undef HTTP_ERRNO_GEN

    /* Get an http_errno value from an http_parser */
    #define HTTP_PARSER_ERRNO(p) ((enum http_errno)(p)->http_errno)

struct http_parser {
    /** PRIVATE **/
    unsigned int type : 2;         /* enum http_parser_type */
    unsigned int flags : 8;        /* F_* values from 'flags' enum; semi-public */
    unsigned int state : 7;        /* enum state from http_parser.c */
    unsigned int header_state : 7; /* enum header_state from http_parser.c */
    unsigned int index : 7;        /* index into current matcher */
    unsigned int lenient_http_headers : 1;

    uint32_t nread;          /* # bytes read in various scenarios */
    uint64_t content_length; /* # bytes in body (0 if no Content-Length header) */

    /** READ-ONLY **/
    unsigned short http_major;     //NOLINT(google-runtime-int)
    unsigned short http_minor;     //NOLINT(google-runtime-int)
    unsigned int status_code : 16; /* responses only */
    unsigned int method : 8;       /* requests only */
    unsigned int http_errno : 7;

    /* 1 = Upgrade header was present and the parser has exited because of that.
   * 0 = No upgrade header present.
   * Should be checked when http_parser_execute() returns in addition to
   * error checking.
   */
    unsigned int upgrade : 1;

    /** PUBLIC **/
    void *data; /* A pointer to get hook to the "connection" or "socket" object */
};

struct http_parser_settings {
    http_cb on_message_begin;
    http_data_cb on_url;
    http_data_cb on_status;
    http_data_cb on_header_field;
    http_data_cb on_header_value;
    http_cb on_headers_complete;
    http_data_cb on_body;
    http_cb on_message_complete;
    /* When on_chunk_header is called, the current chunk length is stored
   * in parser->content_length.
   */
    http_cb on_chunk_header;
    http_cb on_chunk_complete;
};

enum http_parser_url_fields { UF_SCHEMA = 0, //NOLINT(readability-identifier-naming)
                              UF_HOST = 1,
                              UF_PORT = 2,
                              UF_PATH = 3,
                              UF_QUERY = 4,
                              UF_FRAGMENT = 5,
                              UF_USERINFO = 6,
                              UF_MAX = 7
};

/* Result structure for http_parser_parse_url().
 *
 * Callers should index into field_data[] with UF_* values iff field_set
 * has the relevant (1 << UF_*) bit set. As a courtesy to clients (and
 * because we probably have padding left over), we convert any port to
 * a uint16_t.
 */
struct http_parser_url { //NOLINT(readability-identifier-naming)
    uint16_t field_set;  /* Bitmask of (1 << UF_*) values */
    uint16_t port;       /* Converted UF_PORT string */

    struct {
        uint16_t off; /* Offset into buffer in which field starts */
        uint16_t len; /* Length of run in buffer */
    } field_data[UF_MAX];
};

/* Returns the library version. Bits 16-23 contain the major version number,
 * bits 8-15 the minor version number and bits 0-7 the patch level.
 * Usage example:
 *
 *   unsigned long version = http_parser_version();
 *   unsigned major = (version >> 16) & 255;
 *   unsigned minor = (version >> 8) & 255;
 *   unsigned patch = version & 255;
 *   printf("http_parser v%u.%u.%u\n", major, minor, patch);
 */
unsigned long http_parser_version(void); //NOLINT(readability-identifier-naming,google-runtime-int)

void http_parser_init(http_parser *parser, enum http_parser_type type); //NOLINT(readability-identifier-naming)

/* Initialize http_parser_settings members to 0
 */
void http_parser_settings_init(http_parser_settings *settings); //NOLINT(readability-identifier-naming)

/* Executes the parser. Returns number of parsed bytes. Sets
 * `parser->http_errno` on error. */
size_t http_parser_execute(http_parser *parser, //NOLINT(readability-identifier-naming)
                           const http_parser_settings *settings,
                           const char *data,
                           size_t len);

/* If http_should_keep_alive() in the on_headers_complete or
 * on_message_complete callback returns 0, then this should be
 * the last message on the connection.
 * If you are the server, respond with the "Connection: close" header.
 * If you are the client, close the connection.
 */
int http_should_keep_alive(const http_parser *parser); //NOLINT(readability-identifier-naming)

/* Returns a string version of the HTTP method. */
const char *http_method_str(enum http_method m); //NOLINT(readability-identifier-naming)

/* Return a string name of the given error */
const char *http_errno_name(enum http_errno err); //NOLINT(readability-identifier-naming)

/* Return a string description of the given error */
const char *http_errno_description(enum http_errno err); //NOLINT(readability-identifier-naming)

/* Initialize all http_parser_url members to 0 */
void http_parser_url_init(struct http_parser_url *u); //NOLINT(readability-identifier-naming)

/* Parse a URL; return nonzero on failure */
int http_parser_parse_url(const char *buf, size_t buflen, //NOLINT(readability-identifier-naming)
                          int is_connect,                 //NOLINT(readability-identifier-naming)
                          struct http_parser_url *u);

/* Pause or un-pause the parser; a nonzero value pauses */
void http_parser_pause(http_parser *parser, int paused); //NOLINT(readability-identifier-naming)

/* Checks if this is the final chunk of the body. */
int http_body_is_final(const http_parser *parser); //NOLINT(readability-identifier-naming)

    #ifdef __cplusplus
}
    #endif

#endif // #if (SCRIPT_ENGINE_TYPE == SCRIPT_ENGINE_V8) && SE_ENABLE_INSPECTOR

#endif
